In January of last year the Moviemania chain of movie theaters started popping its popcorn in canola oil ,instead of the less health cconut oil taht it had been using until then. Now Moviemania is planing to switch back, saying that the changes has hurt popcorn sales. that claim is false, since according to Moviemania's own sales figures, MOviemania sold 5 percent more popcorn last year than in the previous year.

which supports the argument against Moviemania's claim?

A total sales of all refreshments at Moviemania's movie theaters increased by less than 5 percent last year...

A is the answer 请问怎么理解？ 是说，其他的都没有popcorn的利润高吗？

别人增长的都不到5%，可见他是没有hurt sales的，借口找错了

反过来，weaken题的话，说市场其他商家的增长都有30%了，这样它才是有受到伤害。

写作文的时候不是也有注意 百分比出现的时候要小心比较的对象啊